Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ade3a099bf6d9a2…

MALICIOUS

PDF

58.0 KB Created: 2020-12-07 23:56:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0de434e282139a68f553234b5f4ce1c3 SHA-1: ff55d26a5e65149fe1d637a1ce141693b8f2006f SHA-256: 4ade3a099bf6d9a20c1c95ae7850e14223a87cc5bbc5a258260ae9134277dfd7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating it's a phishing trojan. An embedded URI points to a suspicious domain, likely used to host malicious content or redirect the user. The document body, though heavily obfuscated, contains text suggesting it is a 'worksheet', which is a common lure for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffe.ru/123?utm_term=time+match+up+worksheet PDF link annotation
    • https://geredape.weebly.com/uploads/1/3/4/3/134349068/nadisidemoda_duwugegazaseb_motenuzegifi.pdfIn PDF document text
    • https://noxazifegem.weebly.com/uploads/1/3/4/5/134596672/3734630.pdfIn PDF document text
    • https://sugulidan.weebly.com/uploads/1/3/4/5/134508933/dezufilijiradu.pdfIn PDF document text
    • https://wuxotiwor.weebly.com/uploads/1/3/4/3/134335057/xuwalelimogopukepa.pdfIn PDF document text
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/2543267.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/lomisuseku.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/zanojigepaxesesoxisajor.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/seer_anointing_book.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/kikozadarolog.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/sewijiduderokavivukan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68da7266-2f1a-4a1d-ac47-3f41ffa78c6c/black_devil_cigarettes_buy_online.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/age_of_exploration_crossword_review_answers.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA985 5244 bytes
SHA-256: 4112d8e853f04277a8676fdf7420944ee3e18c5435ae20435ca05be564d59e11
font_01_sfnt_off0000bb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3D 9420 bytes
SHA-256: c6d13deb08fd44c1f4e8e58ffbc99bfc3cb0ec5f8a84d1f002fc051bad9743ab